Sound-concentrator.



,M'. LORiMER & A. T. ZIEGLER.

I SOUND UONCENTRATOR.

APPLIUATION FILED MAR. 1, 1911.

'Paented.liov.5,l9l2.

INVENTORS.

ATTORN EY an svauast's corr purrnn STA'ZllES Parana @FFKCE WILLIAMMVLORIIVIER, OF NEW WILMINGTON, AND'AIQFBED T. ZIEG-LER, OF PITTS-,BURGH, PENNSYLVANIA; SAID ZIEGLER'ASSIGNOR TO SAID LORIMER.

soUNn-coNoENTRaToR.

To all whom may concern:

Be it knownthat we, WILnIAM M. LoR1- MER, a resident of New Wilm ngton,1n the county of Lawrence and State of Pennsylvania, and ALFRED T.-ZIEGLER, a resident of Pittsbu rgh, in the county of Allegheny and Stateof Pennsylvania,have invented a new and useful Improvement inSound-Concem' trators, of which the of hearing is imp-airedandparticularly to waves as may be the transmitter elements which serve togather, concentrate and intensify such sound produced-in the vicinity ofthe instrument;

The object of the invention is to-provide a light, snnple and compactdevice for collecting, concentrating and intensifying sound waves'insuch manner as to insure a maximum degree of efliciency, as regards boththe'collection of such waves from wide areas or various direct-ions, andthe intensi,

, is a sectional view. through the center. of a sound concentrator andtransmitter that embodies the invention; Fig. 2 IS a View, partiallyinfront elevation and partially in section, of the device shown in Fig. 1;and Fig.

3 is a diagrammatic View of the device and some of the representativesound waves received thereby.

The op-eratingparts of the apparatus constituting the invention aremounted in and supported by a case 1.0f conducting material, preferablyof aluminum, though not necessarily of thi or any other specificmaterial. The other metal parts of the instrument are also preferablymade of aluminum,

' though the invention is in no wise limited in this regard.

Fastened to the bottom of the case 1, upon the-inside, is a metal ring2, and clamped to the front face of the ring 2, by means of 1: secondmetal ring 3, is a thin circular diaphragm t preferably of carbon. A

carbon block 5 is mounted centrally upon the base of the case 1, betweenthe base and the diaphragm 4, suitablev insulation 6 being interposedbetween the block and the base of the case. and the block being clampedto the base by means of one or more suitable in Specification of LettersPatent. Application fileii March 1, 1911. Serial No. 611,725.

Patented Nov. 5, 1912.

sulated screws 7. The front face of the bio 2k 5 is provided witha-plur'ality of recesses 8 in- ,which are disposed small balls orgranules 8* of carbon which normally rest against the diaphragm 4 andserve to make vibratory contact therewith and with the block .5, as isusual in transmitting devices of this; general character.

frusto-conical metal deflector. 9 is mounted upon the rim of the case 1-'and its outer edge is clamped between the edge of the case and a cap orcover 10. The cap 10 comprises an outer rim 11 having'a flange l2thatfits over the outer face of the case and is fastened theretobyscrews or other suitable means. The cap also comprises a relativelysmall center piece 13 and a plurality of arms 14 which constituteintegral parts.

of the portions 11 and 13 and may be varied in number as may be desired.Obstruction to the'sound waves passing into the case is, of course,undesirable and, consequently, the arms 14 are narrow and as few innumher as will serve to properly support the center piece 13.

A conical deflector 15 is fastened to the portion 13 by means of a screw16, and projects to substantially the plane of the inner end of thefrusto-conical deflector 9. The part 15 may also be of'frusto-conicalform and of less depth thanthe deflector 9, if desired, though. a deviceof substantially the form and dimensions shown will probably be foundpreferable.

In order to make the proper and desired connections to an electriccircuit for utilizing the device thus fardescribed in connection with asuitable receiver, we connect one conductor 17 of the circuit to thecase 1, and consequently to the rings 2and 3 and the diaphragm 4, andthe other conductor 18 of the circuitto the block 5 by means of a strip19 of copper or other good conducting material, a suitable notch orrecess 20 being provided in the ring 2 to accommodate the strip 19without contact between the parts. Either the recess or the strip may,of course, be provided with suitable insulation, if desired, in order toavoid all danger of contact between the said parts.

Any suitable means may be employed for making the desired circuitconnections with the 'case 1 and the strip 19 but the means which weprefer to employ -comprise an'insulating block 21 having a recess 22, abindmg screw 23, the head of which is located in the recess 22, bindingnuts 24 for clamping the conductor 18 and the end of the strip 19 toeach and to the block 21, a binding screw 25 having its head seated in are cess in the outer face of the case 1, a holding nut 26 and a bindingnut 27 for clamping the conductor 17 a ainst the nut 26.

It will be understoo from the foregoing description, in view of thedrawings+particular reference being now had to, Fig. 3 that the devicewhich embodies the -invention presents a very wide opening for thereception of sound waves, and consequently that sounds produced in anypart of a wide -area will be intercepted. It will be noted further thatthe opening through which the sound waves are projected against thediaphragm is relatively small, and that the consequent condensation ofthe sound waves produces an intensification of the sound that istransmitted to the ear. It will be noted further. that aconsiderable perentage v of the sound waves will impinge directly upon thediaphragm-this being true'for nearly all angles of movements of theintercepted waves. Some of the waves will, of course, impinge upon thedeflector 9, as indicated in Fig. 3-of the drawing, and these willbedeflected against the deflector 15 and thence against the diaphragm 4.

An importantand desirable characteristic of the invention is the directutilization, in a forward direction, ofall sound waves that areintercepted, it being possible thereby to secure a maximumoperatingefliciency.

We desire it to be understood that, while the specific elements shownand described are desirable and effective in service, any variationsfrom what is shown which do not materially modi or change the mode ofoperation or the result are within the spirit and scope of theinvention.

1. A sound concentrator comprising a case having an open-work coverorcap, a diaphragm supportedwithin the case adjacent to its base,a'frusto-conical deflector clamped between the capiandthe edge of thecase, and a centrally mounted'on said cap. v

2. A sound concentrator comprising a case having a cap consisting of arim, a center piece and radial arms, a diaphragm supported with thecase, a fru'sto-conical deflect tor having its outer edge clamdpedbetween the-cap and the case ed e an its smaller end adjacent to saiddiap ragm, and a relatively small conical deflector projecting in--wardly from the center piece of said cap.

Copies bf-,thiapatent maybe abtained for five cents each, by addressingthe commissioner of Patents,

' Washington, D. G.

located conical deflector 3. A sound concentrator comprising a casehaving an o en-work cap, a frusto-conical deflector clamped between thecap and the edge of the case, and a small conical deflector centrallysupported by the cap.

4. A transmitter comprising a metal case, a diaphragm supported withinthe case and near its rear wall, a frusto-conical deflector supported bythe front edge of the peripheral wall of -said casing and having itssmaller end terminating in front of and adjacent to said diaphragm,means for securing the front end-of said deflector to the front edge ofthe peripheral wallof the cusing, arelatively small conical deflectorconcentrically disposed within said frusto-conical deflector with itssmaller (and also adjacent to said diaphragm, and means for impartingthe vibratory influence of said diaphragm to an electric circuit.

5. A sound concentrator 'comprisinga case, a diaphragm supportedcentrally in the case adjacent to its base, a frusto-conicaldeflecting-shell having its outer end supported by the edge of the rimofthe case and extending inwardly into proximity to the central portionof the diaphragm, and a cover or cap secured to the case and closing thesame, said cover or cap being provided with large openings extending outsubstantially to the edge of the deflecting shell.

6. A sound concentrator comprising a case, a diaphragm, supported in thecase adjacent to its base, a frusto-conical shell extending from thefree edge of the case inwardly with its small end in proximity to thecentral portion of the diaphragm, and a cover or cap secured to the caseand clamping the -outer larger edge of the deflecting shell against theedge of the case, 'said cover or cap being of open work extending outsubstantially to the outer end of'the deflecting shell.

7. -A sound concentrator comprising a case having a cap consisting of arim and small center piece, a radial arm with openings therebetweenextending out to the walls of the case, a diaphragm supported within thecase, and a frusto-conical deflecting shell having its outer larger edgeclamped between the cap and the edge of the case and its smallerend.loca ted adjacent to the central portion of said diaphragm.

In testimony whereof, wefhav'e hereunto set our hands. I

' WILLIAM M. LORIMER. ALFRED T. ZIEGLER.

Witnesses:

F. W. WINTER, MARY E. Car oon.

